Teaching basic lab skillsfor research computing

Trimming the Python Lesson

We are close to releasing a new version of
our standard Python lesson
that uses Python 3 instead of Python 2.
As soon as that's done,
we're going to warm up this discussion
about fixing that lesson.
One new contribution to that is this post by Byron Smith
about how he trimmed the existing lesson.
If you have other experiences or comments,
please add them to this GitHub issue
so that we can make decisions in September about what to include in Version 5.4 in November.